Sewing machine



April 1, 1941- H. HACKLANDER ETAL 37,273

SEWING MACHINE Filed June 22, 1937 4 Sheets-Sheet 2 .MN mm .QN a

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April 1941- H. HACKLANDER ETAL 2,237,273

SEWING HACHINE Filed June 22, 1937 4 Sheets-Sheet 3 WITNESSES.- 1 INVENTORSI 7mm imcklander 2&1

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Patented Apr. 1, 1941 2,231,273 SEWING aonnvr.

-Hans Hacklander, Linden, N. 1., and George Sauer, Berwyn, Ill., assignors to Union Special Machine Company, C

' of Illinois hicago, Ill., acorporation Application June 22,1937, Serial No. 149,594

6 Claims. (01. 194-6),

This invention relates to sewing machines, and it has reference more particularly to feed-offthe-arm sewing machines such as typified in U. S. Patent No. 1,741,095, granted to Norman V. Qhristensen and Harold J; Le Vesconte on December 24, 1929. In a machine of the kind specifically referred to, the drive shaft and its bearlugs and the needle actuating mechanism are enclosed within a hollow longitudinally-extending tubular elevated portion of the machine frame; while the complemental stitch-forming mechanism and the feeding mechanism are enclosed within a hollow underreaching work supporting arm and operated, through strap rods e itending downwardlywithin a vertical tubular frame portion which connects the rear end of said work supporting arm with said elevated frame portion, by rotary eccentric actuators on said drive shaft. By virtue of the great number of moving parts within the elevated portion of the machine frame and to the inaccessibility of these parts, considerable time is consumed in properly oiling them; and if oiling is neglected through indifference or, carelessness as often happens, rapid wear wlll ensue particularly when the machine is operated at high speeds, thereby necessitating either complete replacement of the worn parts or costly repairs.

ur invention has for its aim to obviate such contingencies, which desideratum we attain as hereinafter more fully disclosed, by forming the drive shaft hollow and with lateral ports for capacity to conduct oil from a gravity supply reservoir to the shaft bearings and the rotary actuators, by incorporating in the frame structure secondary sumps to receive the excess or overing the oil accumulating in the main sump to the reservoir for re-passage through the machine,

Other objects and attendant advantages will appear from the following detailed description of the attached drawings, wherein Fig. I is a view inside elevation of a feed-oif-the-arm sewing machine conveniently embodying the present improvements, portions of the machine frame having been broken away to show the mechanism at the interior.

Fig. II is a plan view of the machine, likewise with portions of the frame broken out.

Fig. III is a fragmentary detail sectional view taken as indicated by the arrows III-III in Figs. I and II, and drawn to a larger scale.

Fig. IV is a fragmentary detail sectional view similarly drawn to a larger scale and taken as indicated by the arrows IV--IV in Fig. I.

Fig, V is a fragmentary detail sectional view on an enlarged scale taken as indicated by the arrows V-V in Fig. II.

Fig. VI is a longitudinal vertical sectional view through the work support arm of the machine showing the feeding and the auxiliary stitchforming mechanism; and

Fig. VII is a view partly in elevation and partly in horizontal section taken as indicated by theprojecting laterally from the elevated frame portion I and det-achably secured thereto by screws, one of which is shown at 6 in Fig. III. Extending longitudinally through the hollow of the elevated frame portion l is a drive shaft 1 which is joumaled'in bearing bushings 8, 9, I0 and II whereof the bushings 9 and II) are set into crosswise extending partitions l2 and I3 and the bushings 8 and II respectively set into the front and rear end walls It and ii of said frame portion. To the front protruding end of the shaft 1- is secured a combined hand and belt wheel I6 whereby it can be operated either normally or by power. Guided for up andv down movement in the head 5 is a vertical needle bar ll, which, at its lower end, carries a pair of needles l8, and which, as shown in Figs. I and III, is slidable in bushings l9 and 20, fixed respectively to the top and bottom walls 2| and 22 of said head.

The needle bar H is in this instance-actuated by means including a transverse shaft 23 which is journaled in a bearing boss 24 on the back wall 25 of the head 5, said boss extending through an offset 26 in the side wall 21'of the elevated tubular frame portion I, see Figs. 11 and III, and

rotary motion being imparted from the drive shaft I to said transverse shaft through a pair needle bar I1 is restrained against rotation a a. consequence of confinement of the outer end of the stud projection 35 on the collar 34 in the vertical slot 35 of a fixed guide 35 within the head 5, see Figs. I and III. The presser bar 31 of the machine has sliding guides near its lower end in a bearing bushing 33 set into the bottom wall 22 of the head 5, and near its top in a bearing lug 39 which reaches inward from one of the side walls of said head. By means of a leaf spring whereof the outer or moving end, shown at 40 in Fig. I, the presser bar 31 is urged downward to maintain the presser foot 4| at the lower end thereof (Fig. I) in yielding contact with the fabric (not shown) which is sewed in the machine. Rotation of the presser bar 31 is prevented through engagement of the projection 42 of a collar 43 thereof with a vertical slot in another fixed guide block 44 within the head 5, see Fig. I. The complementary mechanism which cooperates with the needles I3 in the formation of seam stitches and the feeding mechanism of themachine are disposed within the hollow of the work support 3, as shown in Figs. VI and VII. They may be of the form disclosed in separate patents numbered 2,199,663 and 2,211,619 maturing from applications filed by us concurrently herewith, having various of their moving parts operated as presently explained through a series of strap rods 45 which extend downward of the vertical hollow 4 of the machine frame, by rotary eccentric actuators 45 afllxed to the portion of the drive shaft I in the interval between the partition I3 and the rear wall I5 of the elevated tubular frame portion, as shown in Figs. I and II.

Reierringto Figs. VI and VII, the complemental stitch-forming mechanism includes a looper |0| which is attached to the outer end of a horizontal shaft I02 suitably joumaled in bearings I03, I04 and I05 within the hollow of the work arm 3. Secured to the shaft I02 in the interval between bearings I04 and I05 is a ball crank arm I05 whereto the eccentric strap rod 45b is connected at its lower end, and whereby oscillatory movements are induced in the shaft to impart needle-avoiding movements to the looper IOI. Near its inner end the shaft I02 (Fig. VI) carries a swivel collar I01, which, by means of a horizontal link I08, is coupled with the pendant arm of a bell crank lever I09 freely fulcrumed on a cross pin 0. The horizontal arm of the bell crank lever I00 is in turn connected to the lower end of the eccentric strap rod 45d. As a consequence of this arrangement, the shaft I02 is reciprocated endwise for impartation of loop taking movements to the looper IOI. Surrounding the shaft I02 is a sleeve III, which, at its outer end, carries a spreader 2 to coact with the looper IOI. As shown, the shaft III extends inward somewhat beyond the bearing I04, and to its protruding inner end is secured a ball arm 3 whereto the lower end of the eccentric strap rod 45 is connected to impart oscillatory movements to the sleeve III and the spreader 2 carried thereby.

The feeding mechanism of the machine comprises a feed dog 5 which operates upwardly through an apertured throat plate 3 at the top of the free end of the work supporting arm, and which is fixedly secured to the outer endof a feed bar I I1 extending longitudinally of the hollow of said work support. Adjacent its front end, the feed bar III is confined against lateral movement in the longitudinal slot of a guide partition I I8 extending crosswise of the hollow of the work arm. Immediately inward of the partition III the feed bar III is coupled, by means of a vertical link 9, with the horizontal arm of a bell crank lever I20 fulcrumed on a fixed transverse pin I2I. The upright arm of the bell crank lever I20 is in turn coupled, by means of a horizontal link I22, with a bell crank I23 fulcrumed to swing on a cross pin I24 extending crosswise of the work arm 3 at the rear end of the latter. To the horizontal extremity of the bell crank I23 is pivotally connected the lower end of the eccentric rod 45a. At its rear end the feed bar III is pivotally connected to the pendant arm of still another bell crank I25 free on the cross pin 0 which serves the bell crank I09 previously referred to, the horizontal arm of said bell crank lever I23 being pivotally connected to the lower end of the eccentric rod 450. By this means, both horizontal or feeding movements and up and down or lift movements are imparted to the feed dog as required to intermittently advance the material outwardly along the work arm 3. For other details of the complemental stitch-forming and feeding mechanisms, reference may be had to the other co-pending applications hereinbefore referred to.

In order to adapt a machine such as has been briefly described to the purpose of our invention, provisions have been made as follows: Extending axially through the drive shaft I is a duct 41, which, it will be noted from Figs. I and II, is in communication at its rear end with a chamber 43 within the bore 49 for the bearing bushing II, said chamber being closed at the back by a diaphragm 50. The lubricating oil flows by gravity into the shaft I from a supply reservoir 5| located within the hollow of the elevated longitudinal frame portion I above the eccentric actuators 43, see Fig. I. A conical nipple 52 on an elbow outlet tube 53 at the rear end of the reservoir 5| engages the mouth of a horizontal flow passage 54 in the wall I5 of the elevated frame portion I, said passage having a vertical branch 55 which leads downward into the chamber 43, see Fig. I. Flow of the oil from the reservoir 5| is controlled by a. submerged wick which reaches into the elbow outlet tube 53. Cooperating with the nipple 52 In holding the reservoir 5| in place is a screw bolt 56 whereof the shank threadedly engages a tapped hole 51 in the partition I3 and whereof the head bears against the front end of said reservoir. By virtue of this arrangement, the reservoir 5| may be removed for cleaning when required by backing off the screw bolt 50 after withdrawing a top cover 58 which closes the hollow in the rear of the elevated frame portion I. Part of the oil thus received from the reservoir 5| flows through lateral ports 59, 60' and 9|, into the bearings 3, 9 and I0 for the drive shaft 1, the

rear bearing II being lubricated as a consequence of being exposed directly within the chamber 43. As shown in Fig. I, the shaft is also provided with a series of lateral ports 02 which lead to annular clearances 03 within the rotary eccentric actuators 45. From these clearances 53, the oil flows through lateral ports 04 in the rotary actuators 46 to the spherical surfaces of the latter. The front end wall I4 of the elevated tubular portion I of the machine frame is formed with an annular recess 05 in concentric relation to the axis of the shaft I, which recess is closed by a plate 33 apertured for passage of the hub 01 of the combined end wheel and pulley I5. The well 53 thus formed receives the excess or overflow oil from the bearing 8. The overflow oil from the bearing 9 is received in a sump 89 at the bottom of a housing 18 for the gears 28 and 29 within the elevated tubular portion I of the frame. As shown in Fig. III, the housing 18 is defined by the end wall l4, the partition l2, the offset 25 of the side wall 21 of said elevated frame portion, and by a supplemental wall or partition II. The overflow of oil from the well 88 for the front bearing 8 for the shaft 1 also drains into the sump 89 by way of a by pass'88a in the end wall l4, see Figs. I and II. The housing 18 is closed at the top by a cover plate 12 (Fig. III) which is removably secured by screws 13 and which is in turn accessible upon removal of a top cover section 14 closing the hollow of the elevated frame portion I rearward of the head 5, the cover section being likewise secured by screws 15. As shown in Fig. III, the gears 28 and 29 dip into the oil within the sump 59 and are thus lubricated by a splash action. Some of the oil thus lifted by the gears 28, 29 finds its way to a port 18 in the top of the bearing boss 24 and thus lubricates the spaced bearing bushings 18, 19 for said shaft. The oil which accumulates in the sump 69 drains by way of a tubular dowel pin 88 (Fig. III) into a sump 8| in the bottom of the head 5. By means of a disk 82 attached to the balanced crank member 38 and dipping into the oil in the sump 8|,

oil is distributed in the form of a mist over the needle bar actuating parts withinthe head as well as over the parts associated with the presser bar 31. In order to further insure adequate lubrication of the pin bearings for the pitman 32, the latter is formed with a longitudinal duct. 83, and with a communicating oil scoop 84 at its lower end, see Figs. I and III. Overflow oil from the sump 8| in the head 5 drains by way of ports 85 and 86 respectively in the partitions l2 and I3 into a main sump 81 within the rear portion of the work support 3, see Fig. I, which main sump also receives the drip oil from the drive shaft bearings l8 and H and from the rotary eccentric actuators 46. It will thus be seen that all the moving parts within the elevated portion of the machine and in the head 5 are automatically lubricated by gravitational flow of oil from the reservoir 5|.

In order that the oil collected in the main sump 81 may be returned from time to time to the supply reservoir 5|, there is provided a hand pump means shown in Figs. I, II, IV and V, as comprising a piston 88 which is movable up and down within a cylinder 89 integrally formed with the rear end wall l5 of the elevated frame portion I. As shown in Fig. V, the rod 98 of the piston 88 passes through a plug or head 9| which closes the cylinder 89 and which is removably secured by a set screw 92. A port 93 in the plug or head 9| permits the air to escape from the upper part of the cylinder 89 during operation of the pump. .At the top, the piston rod 98 is provided witlr'a hand knob 94 by which it can be grasped for the purpose of actuating the pump. Connecting into the bottom of the cylinder 89 is a screw nipple 95 with an incorporated springpressed ball check valve 98, which opens under suction; and leading downwardly from said nipple is a tube 91 which terminates in a screen or filter head 98 submerged in the oil within the main sump, see Fig. I. Near its bottom, (Fig. IV) the cylinder 89 communicates, by way of a duct 99 in the wall l5 of the machine frame with the stroke of the piston 88, the oil is forced from the pump cylinder 89 through the duct 99 and past thecheck valve I88 and into the duct 41 in the drive shaft 1 via the chamber 48. After the shaft 1 is filled, the excess oil passes from the chamber'48 through the ducts 55 and 54 (Fig. 1) into the reservoir 5| in which it is accumulated for reuse.

Having thus described our invention, we claim: 1. In a sewing machine, a frame having a tubular horizontal portion with a hollow head projecting laterally therefrom; a needle bar guided in the head; a longitudinally-extending tubular drive shaft journaled in a bearing within the tubular frame portion; a gravity oil supply reservoir in communication with the interior of the shaft from which oil is conducted by way of a chamber 48 at the rear end of the shaft 1, within 7 lateral port to the (bearing; a closed housing interiorly of the elevated frame portion with a sump for receiving the overflow oil from the bearing; a transverse shaft extending into the closed housing through another bearing; a pair of gears connecting the two shafts within the housing and dipping into the oil from the sump in the latter to lift it to the transverse shaft bearing; a sump in the head for catching the overflow oil from the last mentioned bearing; operating connections between the transverse shaft and the needle bar lubricated with oil taken from the sump within the head; a main sump for receiving the overflow oil from the sump in the head; and means for returning the oil from the main sump to the reservoir.

2. In a sewing machine, a frame having an elevated tubular horizontal portion with a lateral- -ly projecting hollow head, and a hollow work support whereof thefree end underreaches the head; a needle bar guided in the head; a longitudinally-extending tubular drive shaft journaled in a bearing within the elevated frame portion;

a gravity flow oil supply reservoir in communication with the interior of the shaft from which oil is conducted by way of a lateral port to the bearing; a closed housing interiorly of the elevated frame portion with a sump for receiving the overflow oil from the bearing; a transverse shaft extending into the closed housing through another bearing; a pair of gears connecting the two shafts within the housing and dipping into the oil from the sump in the latter and lifting it to the transverse shaft bearingwa. sump in the head for catching the overflow oil from the last mentioned bearing; operating connections between the transverse shaft and the needle bar lubricated with oil taken from the sump within the head; a main sump for receiving the overflow oil from the sump in the head; and means for returning the oil from the main sump to the reservoir. 1

3. In a sewing machine, a frame having an elevated tubular horizontal portion with a laterally-projecting hollow head, and a hollow work support whereof the free end underreaches said head; a. needle bar guided in the head; a longitudinally extending tubular drive shaft journaled in a bearing within the elevated frame portion; a gravity flow oil supply reservoir in communication with the interior of the shaft from which 011 is conducted by way of a lateral port to the bearing; a closed housing interiorly of the elevated frame portion with a sump for receiving the overflow oil from the bearing; a transverse shaft extending into the closed housing through another bearing; a pair of gears connecting the two shafts within the housing and dipping into the oil in the sump to lift to the transverse shaft bearing; a sump in the head for catching the overflow oil from the last mentioned bearing; operating connections between the transverse shaft and the needle bar lubricated with oil taken from the sump within the head; a main sump within the work support for receiving the overflow from the sump in the head; and means for returning the oil from the main sump to the supply reservoir.

4. In a feed-off-the-arm sewing machine, a frame having an elevated tubular horizontal por tion with a laterally projecting head, and a hollow work supporting arm connected at one end through a vertical tubular portion to said elevated portion with its free end underreaching said head; a needle bar guided in the head; a longitudinally-disposed tubular drive shaft journaled in a hearing within the elevated frame portion; complemental stitch forming and feeding means within the work supporting arm; separate rotary actuators on the drive shaft with operatin connections extending down through the vertical tubular portion of the frame to the complemental stitch forming and feeding means; a gravity flow 011 reservoir in communication with the interior of the drive shaft from which latter oil is conducted by way of individual ports respectively to the bearing and to the rotary actuators aforesaid; a closed housing interiorly of the elevated frame portion with a sump for receiving the overflow oil from the elevated portion; a transverse shaft extending into the closed housing through another bearing; gears connecting the two shafts within the housing and dipping into the oil from the sump in the latter and lifting it to the transverse shaft bearing; a sump in the head to catch overflow oil from the last mentioned bearing; operating connections between the transverse shaft and the needle bar lubricated with oil taken from the sump in the head; a main sump in the work supporting arm receiving the overflow oil from the rotary actuators on the main shaft and from the sump in the head; and

means for returning the oil from the main sump to the reservoir.

5. In a sewing machine, a frame having 'a tubular horizontal portion with a completely closed hollow head above a hollow work support; a needle bar guided in the head; a longitudinally tubular drive shaft; a bearing within the elevated frame portion having a hollow in communication with the interior of the shaft; a gravity flow oil reservoir within the tubular frame portion above the shaft from which oil is conducted by way of a lateral port to the bearing; a sump formed by a depression at the bottom of the head receiving the overflow oil from the bearing; mechanism wholly above the sump whereby the needle bar is actuated from the drive shaft including a member which intermittently dips into the oil in the sump to lubricate the mechanism by splash action; a main sump within the work support receiving the overflow from the sump in the head; and means for elevating the oil from said main sump to the hollow bearing to flll the hollow of the shaft and the reservoir.

6. In a sewing machine, a frame having a tubular horizontal portion with a completely closed hollow head, above a hollow work support; a needle bar guided in the head; a longitudinally tubular drive shaft; a hearing within the elevated frame portion having a hollow in communication with the interior of the shaft; a gravity flow oil reservoir within the elevated frame portion above the shaft from which oil is conducted by way ofa lateral port to the bearing; a sump formed by a depression at the bottom of the head receiving the overflow oil from the bearing; mechanism wholly above the sump whereby the needle bar is actuated from the drive shaft including a member which intermittently dips into the oil in the sump to lubricate the mechanism by splash action; a main sump within the work supporting arm receiving the overflow from the sump in the head; and means for elevating the oil from the main sump to the hollow bearing to fill the hollow of the shaft and the reservoir including a hand pump whereof the cylinder is integrally formed with the machine frame at the top, a conduit connecting the pump cylinder with said main sump, and a piston within the cylinder having an actuating projection accessible exteriorly of the machine frame.

HANS HACKLANDER.

GEORGE SAUER. 

